Well we already have X5 and X3 for people who want a balance in weight, battery life, portability etc.
Why not a beastly one for people who don't mind the weight or size? Look how well the HifiM8 is doing and that thing is huge. LOL.
The difference between the X7 and HM-901/DX100 will be that it will be cheaper... which is important. And the Fiio UI is shaping up to better too. I'm strong man with big arms and I carry a giant bag around to work. I don't mind the weight or size. Make it a brick as long as it sounds awesome and has plenty of juice for all headphones.
We shall just have to agree to disagree
I say this as someone who is (for the most part) a fan of the DX100, but I do not see the point in another ungainly brick that is barely any smaller than a stacked set-up of DAP+amp, or DAP+DACamp, or DAP+DAC+amp.
Having owned the DX100 I can attest to the fact that although it sounds wonderful it is an absolute pig to carry around if all you are wearing is jeans and a T-shirt (and no rucksack).
To my mind, there is a very important distinction between a 'transportable' DAP and a truly portable DAP. My rule of thumb is that is must reasonably fit into the back pocket of a pair of jeans (the DX100 bulges rediculously, if you can even squeeze it in to a back jeans pocket without tearing the seams apart). Granted, that's just me, but if the X7 gets as big as the HM-901/DX100 then, in my personal view, it has missed the point of being a one-box portable DAP solution.